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ADO-OFDM-based visible light communication system

A technology of ADO-OFDM and visible light communication, which is applied in the field of visible light communication systems, can solve problems such as increased power consumption and low spectral efficiency, and achieve the effects of high power utilization and high spectrum utilization

Inactive Publication Date: 2017-11-24
SUZHOU UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

But ACO-OFDM technology will lead to lower spectral efficiency
In DCO-OFDM, the signal becomes positive by adding a DC bias, but this increases power consumption

Method used

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  • ADO-OFDM-based visible light communication system
  • ADO-OFDM-based visible light communication system
  • ADO-OFDM-based visible light communication system

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Embodiment Construction

[0028] The embodiments of the present invention will be further described in detail below in conjunction with the accompanying drawings.

[0029] figure 1 It is a block diagram of the visible light communication system based on ACO-OFDM. The OFDM symbols generated in the ACO-OFDM-based VLC system undergo serial-to-parallel conversion and modulation. After satisfying Hermitian symmetry, perform inverse fast Fourier transform and add a cyclic prefix to avoid inter-symbol interference. Then perform parallel-serial conversion to obtain serial data, then perform digital-to-analog conversion, and then perform limiting processing after passing through a low-pass filter After being modulated into an optical signal by the optical modulator, it is sent to the channel for transmission. At the receiving end, the received optical signal is converted into an electrical signal through a photoelectric converter. After the analog signal is processed by the filter circuit, it is converted into a...

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Abstract

The invention discloses a visible light communication system based on ADO-OFDM (asymmetrically clipped and direct-current-biased optical orthogonal frequency division multiplexing). The visible light communication system comprises a transmitter end and a receiver end. An ACO-OFDM signal of the transmitter end is transmitted on odd subcarriers, while a DCO-OFDM signal is transmitted on even subcarriers; after IFFT (inverse fast Fourier transform), asymmetrically clipping is carried out on the odd subcarriers, while the signal on the even subcarriers is subjected to DC bias to generate a single-polarity signal; and then, the odd subcarriers and the even subcarriers are merged to form an ADO-OFDM signal. At the receiver end, when the asymmetrically clipping is carried out, the clipping noise of the odd subcarriers exerts an influence on the even subcarriers, so that when the DCO-OFDM signal is recovered, influence of the clipping noise needs to be removed. The ADO-OFDM-based visible light communication system has higher spectrum utilization ratio compared with an ACO-OFDM system, and has higher power utilization rate compared with a DCO-OFDM system.

Description

Technical field [0001] The present invention relates to visible light communication technology, in particular to a visible light communication system based on ADO-OFDM with asymmetric amplitude limiting and DC offset. Background technique [0002] The visible light communication system that uses visible light as the signal carrier, because it works in an unlicensed frequency band, has the advantages of high security, low energy consumption and anti-electromagnetic interference, and has attracted considerable attention in the application of next-generation indoor communication. . Compared with traditional fluorescent lamps, white light emitting diodes (LEDs) can meet the requirements of high efficiency, low voltage and current, and have long life and high reliability. As the future lighting infrastructure, LED can realize the function of communication at the same time, and has a lower cost. If the indoor LED lighting equipment is used in the communication network, efficient indo...

Claims

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Application Information

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IPC IPC(8): H04B10/116H04L27/26
CPCH04B10/116H04L27/2626H04L27/2628H04L27/2647H04L27/265
Inventor 丁俊杰陈浩哲卞诗航吴昊游善红王颖王震沈盈刘威李响杨奇
Owner SUZHOU UNIV
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